Question

38. The shape of the cross section of a canal is a trapezium. If the canal is
10 m wide at the top, 6 m wide at the bottom and the area of its cross
section is 640 m², find the depth of the canal.​

Answer 1

Answer:

Heron's Formula. The cross-section of a canal is in the shape of a trapezium. If the canal is 12 m wide at the top and 8 m wide at the bottom and the area of its cross-section is 84 m2, determine its depth. Hence, the depth of the canal is 8.4 m.

Answer 2

Answer:

#Red official

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Area of the canal = 640 m²

Area of trapezium = 1/2 x (Sum of parallel sides) x (Distance between them) 640 = 1/2 x (10+6) x h

1280/16 = h

h = 80 m

Therefore, the depth of the canal is 80 m.